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BPDU question

I have a pc in my company that is configured as follows:

interface GigabitEthernet1/0/22

switchport access vlan 80

switchport mode access

spanning-tree portfast

Spanning tree info

Gi1/0/11 Desg FWD 4 128.11 Edge P2p

Gi1/0/12 Desg FWD 4 128.12 Edge P2p

Gi1/0/13 Desg FWD 4 128.13 Edge P2p

Gi1/0/14 Desg FWD 19 128.14 Edge P2p

Gi1/0/20 Desg FWD 19 128.20 Edge P2p

Gi1/0/21 Desg FWD 4 128.21 Edge P2p

Gi1/0/22 Desg FWD 19 128.22 P2p

Gi1/0/23 Desg FWD 4 128.23 Edge P2p

Gi1/0/24 Desg FWD 4 128.24 Edge P2p

Gi1/0/27 Root FWD 4 128.27 P2p

Gi1/0/28 Desg FWD 4 128.28 P2p

Gi2/0/1 Desg FWD 4 128.53 Edge P2p

Gi2/0/2 Desg FWD 19 128.54 Edge P2p

Gi2/0/3 Desg FWD 19 128.55 Edge P2p

If I configure "spanning-tree bpduguard enable" then the port immediatly goes into err-disable

Why is it being picked up as a P2p port and not a Edge P2p port?

ANy help from some experts ?

5 REPLIES
Silver

Re: BPDU question

Hi,

What kind of device is connected to this port (G1/0/22). It looks like this port receives BPDU... Normal pc or switch is connected to the port, if switch that's the reason for err-disable.

bye

FCS

Please rate me if I helped.

New Member

Re: BPDU question

Normal PC running a 10/100 ethernet card.

Shows up as 100 Full on interface.

Silver

Re: BPDU question

Some cards can send BPDU, please check your PC's network card and disable the BPDU sending option if enabled. (http://downloadmirror.intel.com/df-support/10249/ENG/yk51x64.txt)

(if you can test with different machine also good practice)

bye

FCS

Please rate me if I helped.

New Member

Re: BPDU question

Hmm...the user has a software Network MAC bridge setup, its windows xp.

Can this cause this problem ?

Silver

Re: BPDU question

I hope this case your problem, since the PC function as a bridge and send BPDUs...

Remove this configuration and after check the port...

bye

FCS

Please rate me if I helped.

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